Cooling fan logic?(solved bad relay)
jb2wheels
Wagonist
Hello Civic experts.
I have a 90 Civic DX 2WD wagon and it's bone stock. I have questions about how the fans operate.
With the AC on, should both fans run?
With the AC off, should both fans run together intermittently for regular cooling or just the primary fan (pass side)?
My pass side fan was not coming on with the AC today.
With the key "on", if I fire up the AC (blower blowing, blue AC light on), the AC fan blows, but the primary fan does not. Should it?
I pulled the primary fan plug and probed it with the AC "on" as described above - it's not getting 12V. I thought I could feel the cooling fan relay (pass fender by airbox) click when I had my wife push the AC button on/off, but I'm tired and maybe imagining the click.
I don't have a spare relay for checking - I'll drop by the junkyard and grab a handful for troubleshooting.
Any insights?
I have a 90 Civic DX 2WD wagon and it's bone stock. I have questions about how the fans operate.
With the AC on, should both fans run?
With the AC off, should both fans run together intermittently for regular cooling or just the primary fan (pass side)?
My pass side fan was not coming on with the AC today.
With the key "on", if I fire up the AC (blower blowing, blue AC light on), the AC fan blows, but the primary fan does not. Should it?
I pulled the primary fan plug and probed it with the AC "on" as described above - it's not getting 12V. I thought I could feel the cooling fan relay (pass fender by airbox) click when I had my wife push the AC button on/off, but I'm tired and maybe imagining the click.
I don't have a spare relay for checking - I'll drop by the junkyard and grab a handful for troubleshooting.
Any insights?
Comments
Check fuses first. Then possibly the coolant temp sensor, that is what kicks the fan on.
After studying the wiring diagrams, looks like both fans come on together and go off together whether it's the temp sensor or AC turning them on.
I changed the primary ran relay and the fan works fine now. Both come on with the AC instead of just the condensor fan.
Nice thing about junkyards - I got 6 relays, RH inner fender (mine is missing), a pair of 90-91 wagon corners, and some missing Honda/Civic emblems for $30.
If they weren't closing (since I had to go after work) I'd have a pair of brown speaker pods. I hope they're still there on Saturday...
Glad to see it works for you now!!